Method and control unit for regulating a fill level of a reservoir of a catalytic converter for an exhaust gas component in coasting mode

US10914257B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Knopp · Lambach, DE
• Alexandre Wagner · Stuttgart, DE
• Michael Fey · Wiernsheim, DE

Key dates

• Filing date: Oct 9, 2019
• Grant date: Feb 9, 2021
• Expiry date: Oct 9, 2039

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/0814
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for regulating a filling of an exhaust gas component reservoir of a catalytic converter in the exhaust of an internal combustion engine. An actual fill level of the exhaust gas component reservoir is ascertained using a first system model, and in which a baseline lambda setpoint for a first control loop is predefined by a second control loop in which an initial value for the baseline lambda setpoint is converted, by a second system model identical to the first system model, into a fictitious fill level; the fictitious fill level is compared with a setpoint for the fill level; and the baseline lambda setpoint is iteratively modified as a function of the comparison result. At the beginning of a coasting phase, the baseline lambda setpoint is calculated based on signals of sensors and control variables which relate to the delivery of air and/or fuel to combustion chambers.